Fountain pen



C. W. WILLIAMSON.

FOUNTAIN'PEN.

FILED FEB s 1922 Z520-9728012' Cza'rfee ZU." ffz'amson.. ttov-neyaf A'Patented Mar. 27, 1923.

UNITED STATES y CHARLES W. WILLIAMSON',v OF NORTH GRAFTON,MASSACHUSETTS.

FOUNTAIN PEN. i

application ined February 6, 1922. serial No. 534,298.

To all whom t may concern:

Be it known that I, CHARLES l/V. WILLIAM- SON, a citizen of the UnitedStates, residing at North Grafton, in the county of Worcester and Stateof Massachusetts, have invented a new and useful Fountain Pen, of whichthe following is a specication. l

This invent-ion relates to a self-filling fountain pen.

The principal objects thereof are to provide an improved and convenientarrangement for filling the pen capable of adjustment and also havingall its parts readily detachable for cleaning and repairs; and toprovide an arrangement whereby the amount of ink in the pen is alwaysvisib-le so t-hat it can be known without taking the parts to pieceswhether the pen needs refilling.

The invention also involves improvements in details of construction aswill appear.

Reference is to be had to the accompanying drawings, in which- Fig. 1 isa longitudinal central sectional View of a fountain pen constructed inaccordance with this invention; and

Fig. 2 is a similar view showing the pen in the aci; of being filled.

In the form shown, the pen comprises a casing 10 of cylindrical form andof transparent material, as for example, celluloid. It is screwed on orotherwise secured to the head 11 in which t-he pen 12 is designed to belocated. As usual in such a case, the head is provided with a passage 13extending all the way through it alon the pen for the llng ofthereservoir an the passage of the ink. I have shown a cap 14 detachablymounted over the head and it can be located thereon in any desired wayand serves the usual purpose.

At the other end of the barrel 10 a. plug 15 is screwed into it. Thisplug is hollow at the end toward the pen and the hollow part is screwthreaded inside. Into it is screwed the end of a cylinder 17 providingan air chamber. This cylinder can be made of one or two pieces oftransparent material if desired, as for example, celluloid or the like,but is shown all in one piece. It is provided with air ports 18. Theseare all arranged at the same distance from the end. In this cylinderthere is a piston 2O having a rod 21, the piston and rod being providedwith a continuous vent passage 22 extending from one end to the otherall the way.

`air chamber in the Inside'the end of the cylinder 17 is a valve 23screw threaded into a passage through to the end of the plug 15 andhaving. a passage for the piston rod 21. On the outer end of this valveis a wheel or knurled head 24 for turning the valve and adjusting it.The piston rod 21 extends out through the end of this head and isprovided with a head 24 onits. end for manipulating it.y 1A cap 26 visshown screwed on this end of the pen for the usual purpose'. i

In filling the pen, the valve 23 is located as near as desired to theports 18 but so as to uncover them. Now, the piston is drawn out, thecaps v14 and 26 having been removed.

This results in forcing the air out of the v cylinder 17 through theports-.18 and through the ink chamber 27 w-hich'i-s located between thecylinders 17 and 10 and out the port 13. Now, when the bottom of thehead 11 is placed in the ink as shown in Fig. 2 and the piston 20 forcedin from the position shown in Fig. 2 to that shown in ig. 1, there is noway for the air to come into the inside of the cylinder 17 and fill thespace previously occupied by the piston except through the ports 18.This air is necessarily supplied Yfrom the chamber 27 and the movementof the air from this chamber upwardly draws the ink up into the chamber27 according to the well known laws of physics.

The ink is not intended to enter the ports 18 and the two chambers aredesigned so that their cubic contents are such as not to cause the inkto pass through thesepassages when t-he piston is moved to its limitingposition. But in order to prevent the ink passing into this air chamberafter the piston is brought down to its limiting position and to permitthe pen to be located in any desired position, the valve 23 is nowscrewed in to a position to cover the ports 18 as 17 beyond the piston2O and permitting it toperform the above mentioned functions. It will beseen, therefore, that the self-filling pen involves a very simpleconstruction and a filling arrangement which is easily operated. Thereis no danger of the parts getting out of operation unless very badlymisused. 'i

Although I have illustrated and described only a single form of theinvention I am aware of the fact that modifications can be made thereinby any erson skilled in the art without departing rom the scope of theinve-ntion as expressed in the claims. There fore, I do not wish to belimited to all the details of construction herein shown and describedbut what I do claim is:

l. In a self-filling fountain pen, the combination of an ink chamberwith an air Chamber inside it, of a piston in the air chamber, the airchamber having ports beyond the piston for connecting it with the inkchamber to permit of the filling of the ink chamber by the movement ofthe piston along the air chamber t0 draw the air into the latter Chamberfrom the ink Chamber, and a valve for Closing said ports when the pen isiilled.

2. In a fountain pen, the combination of a barrel having an ink Chamber'therein, a Cylinder in the ink chamber having an air chamber therein, apiston in the air chamber, ports connecting the two chambers, anadjustable valve fitting in the end of the air chamber and adapted toclose and open the ports, said valve being arranged to be operated frombeyond the end of the barrel.

3. In a fountain pen, the combination of a barrel having an ink chamber7an air chamber therein, a piston in the air chamber, ports connectingthe two chambers, and an adjustable valve fitting` in the end of the airchamber and adapted to close and open the ports, the piston having apiston rodv eX- tending through and beyond the valve andguided'oentrally thereby, said piston rod being provided with a ventextending all the Way from one end to the other.

4e. In a fountain pen, the combination of a barrel having an inl;chamber, an air cham ber thereirnia piston in the air Chamber, portsConnecting the two chambers, an ad'- justable valve fitting in the airchamber and adapted to close and open the ports, and a plug at the endof the barrel removably connected therewith, said cylinder bei-ngdetaohably mounted on the inner end ot said plug.

In testimony whereof I have hereunto at@ xed my signature.

CHARLES W. WILLIAMSON.

